JPH087943Y2 - Thin plate press cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a thin plate press cutting device for molding large parts such as a roof and a hood of an automobile.

(Prior Art) A press cutting device for molding a roof, a hood, a door panel, and the like which form a body of an automobile is composed of a lower mold and an upper mold. A forming portion is provided on the surface of the lower mold and the upper mold facing each other, and a thin plate as a workpiece is formed into a predetermined shape by pressing the upper mold. Further, a lower blade is provided on the lower die located on the peripheral portion of the forming portion, an upper blade is provided on the upper die, and a cutting portion for cutting the thin plate is provided. Then, the thin plate is formed by the upper die press at the forming portion and the peripheral portion of the thin plate is cut at the cutting portion.

However, as shown in FIG. 3, the radius of curvature of the molding portion 3 provided on the facing surfaces of the lower mold 1 and the upper mold 2 becomes small,
When the angle α between the lower blade 4 provided on the lower die 1 and the forming portion 3 becomes an obtuse angle, the upper blade 5 escapes to the outside when the upper blade 5 descends, which causes a problem that the sharpness becomes dull.

Therefore, conventionally, as shown in FIG. 4 (a), the peripheral portion of the lower die 6 and the upper die 7, that is, the forming portion 10 near the boundary between the lower blade 8 and the upper blade 9 is curved upward. The angle α between the lower blade 4 and the molding portion 3 is set to an acute angle to prevent the sharpness from being reduced. Then, a thin plate 11 as a workpiece.
The peripheral edge 11a is cut off, and then the thin plate 11 is formed by the lower die 13 and the upper die 14 each having the regular forming portion 12, as shown in FIG.

Further, in the conventional case, as shown in FIG.
The split die is adopted, and the movable die 16 moves diagonally while being guided by the guide surface 17 as the upper die 15 descends, and the upper blade 18 is a thin plate.
The peripheral edge portion 11a of 11 is cut at a right angle.

(Problems to be solved by the invention) However, the press die of FIG. 4 described above requires two steps, a cutting step and a forming step, and requires two types of press dies. It causes a cost increase. Further, the press die shown in FIG. 5 can be cut and molded in one step, but the press die is complicated and large, which causes a cost increase.

This invention was made in view of the above circumstances, and the purpose thereof is to perform press cutting of a thin plate in one step, improve work efficiency, reduce the size and simplification of the press die, and reduce the cost. It is an object of the present invention to provide a thin plate press cutting device capable of achieving the above.

[Structure of the Invention] (Means and Actions for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides a molding part on the facing surfaces of a lower mold and an upper mold, and also forms a peripheral part of the molding part. A cutting part having a lower blade on the lower mold and an upper blade on the upper mold is provided, and a flat thin plate is molded by the molding part by a press of the upper mold, and the peripheral part of the thin plate is cut by the cutting part. In the thin plate press cutting device, the cutting unit includes an upper blade and a lower blade that move relatively in a direction orthogonal to the plate surface of the thin plate, and the lower blade is vertically movable in the lower die. A supporting portion for supporting is provided, and the lower blade is urged to the supporting portion in a direction in which the lower blade protrudes upward from the forming portion, and the protruding position of the lower blade is the upper blade before the thin plate starts forming in the forming portion. Is set to the position where the cutting process with Greater than the cutting force of the thin plate due to the lowering of the blade, characterized in that a biasing means is made smaller than the pressing force at the time of the upper die of the press.

As the upper die descends, the peripheral edge of the thin plate is cut by the upper and lower blades, and when the upper die further descends, the biasing spring compresses and the lower blade escapes, and the thin plate is formed into the desired shape by the forming unit. To be done.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire press cutting apparatus, in which 21 is a lower die and 22 is an upper die. The lower die 21 is fixedly installed on the floor surface, and the upper die 22 is moved up and down by a hydraulic device. The lower die 21 is formed with a convex arcuate portion, and the upper die 22 is formed with a concave arcuate portion.The both arcuate portions form a forming portion 24 for forming a flat thin plate 23 as a workpiece into a predetermined shape. are doing.

A lower blade 25 is provided on the peripheral portion of the lower die 21, and an upper blade 26 is provided on the upper die 22 facing the lower blade 25. And upper mold 22
The lower blade 25 and the upper blade 26, which simultaneously form the thin plate 23 at the time of descending and move relatively in the direction orthogonal to the plate surface of the thin plate 23, constitute a cutting portion 27 for cutting the peripheral portion of the thin plate 23. ing.

Next, the cutting section 27 will be described in detail with reference to FIG.
It is configured as shown in (c). That is, the lower mold 21
A supporting portion 28, which is a concave portion that opens upward, is provided at the peripheral edge portion of the. The lower blade 25 is provided on the support portion 28.
Is vertically movably supported, and the lower surface of the lower blade 25 and the support portion 28
An urging spring 29 as an urging means is interposed between the urging spring 29 and the bottom surface. This biasing spring 29 moves the lower blade 25 upward, that is, the lower die.
It is urged in a direction projecting upward from the molding portion 24 of 21,
This urging force is formed to be larger than the cutting force of the thin plate 23 accompanying the lowering of the upper blade 26 and smaller than the pressing force of the upper blade 22 during pressing. Therefore, even when the upper blade 26 descends when the thin plate 23 is cut, the lower blade 25 does not sink into the support portion 28, and the thin plate
23 is kept flat, and the pressing spring 29 compresses the pressing force of the upper die 22 when the upper die 22 is pressed, and the lower blade 25 is retracted so as not to interfere with the support portion 28 and press forming. Is configured.

Next, the operation of the press cutting device configured as described above will be described.

As shown in FIG. 2 (a), a thin plate 23 is interposed in a molding portion 24 between the lower mold 21 and the upper mold 22. At this time, since the lower blade 25 is projected upward by the biasing spring 29, it is located above the molding portion 24. Next, as shown in FIG.
When the upper die 22 descends, the upper blade 26 comes into contact with the peripheral edge of the thin plate 23, and when it further descends, the upper blade 26 slides on the lower blade 25 and the thin plate
Cut off the peripheral edge of 23. At this time, since the urging force of the urging spring 29 is set to be larger than the cutting force of the thin plate 23 due to the lowering of the upper blade 26, the thin plate 23 is not deformed and the plate surface is flat and the upper blade 26 is not deformed. Since they face each other at a right angle, the sharpness is good. Next, as shown in FIG. 7C, when the upper die 22 descends, the biasing spring 29 supporting the lower blade 25 is set to be smaller than the pressing force at the time of pressing. When descending, the lower blade 25 sinks into the support portion 28, and the thin plate 23
Is molded into a predetermined shape. Therefore, upper mold 22
The thin plate 23 can be cut and formed along with the lowering of. When the upper die 22 is lifted up after the molding is completed, the lower blade 25 is projected upward by the biasing spring 29 to prepare for the molding of the next thin plate 23.

Although the urging spring is used as the urging means in the one embodiment, it may be an elastic member or an air cylinder.

[Effect of the Invention] As described above, according to the present invention, the flat plate-like thin plate is cut by the upper blade and the lower blade that move relative to each other in the direction orthogonal to the plate surface, and the lower mold is cut. A support portion is provided for supporting the lower blade so that it can move up and down, and the lower blade is urged to the support portion in a direction projecting upward from the forming portion, and the urging force is applied to the cutting force of the thin plate accompanying the lowering of the upper blade. Greater,
Since the biasing means that is smaller than the pressing force when pressing the upper die is provided, the peripheral edge of the thin plate is cut by the upper blade and the lower blade as the upper die descends, and when the upper die descends, the biasing spring is released. When compressed, the lower blade escapes, and the thin plate is formed into a predetermined shape by the forming unit.

Therefore, a flat thin plate can be trimmed into a predetermined shape as a flat plate, and at this time, the thin plate is cut by the upper blade and the lower blade that move relatively in the direction orthogonal to the plate surface of the thin plate. Regardless of the shape, trimming is always performed at the optimum angle (90 °), the cutting edge has a long life, the quality of the work piece can be improved, and the press cutting of the thin plate can be done in one step, improving the work efficiency. Along with
There is an effect that the press die can be downsized and simplified, and the cost can be reduced.

[Brief description of drawings]

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a vertical sectional front view of a press cutting device, and FIGS. 2 (a) to (c) are vertical sectional front views showing the action of the press cutting. Figure,
FIG. 3, FIG. 4 (a), (b), and FIG. 5 are vertical front views of a conventional press cutting device. 21 …… Lower mold, 22 …… Upper mold, 23 …… Thin plate, 24 …… Molding part,
25 …… Lower blade, 26 …… Upper blade, 27 …… Cutting section, 28 …… Support section, 29 …… Biasing spring.

Claims (1)

[Scope of utility model registration request] 1. A molding part is provided on a surface facing a lower mold and an upper mold, and a cutting part having a lower blade and an upper blade is provided on the lower mold located at a peripheral portion of the molding part. In a press cutting device for a thin plate that forms a flat thin plate with the forming unit by pressing the upper die and cuts the peripheral edge of the thin plate with a cutting unit, the cutting unit is in a direction orthogonal to the plate surface of the thin plate. A lower blade and a lower blade. The lower die is provided with a supporting portion that supports the lower blade so that the lower blade can move up and down. The lower blade projects upward from the forming portion. Is urged in the direction, the protruding position of the lower blade is set to a position where the thin plate is started to be cut with the upper blade before the molding is started in the forming unit, and the urging force is applied to the upper blade. Greater than the cutting force of the thin plate as it descends, but less than the pressing force when the upper die is pressed. A press cutting device for a thin plate, characterized in that it is provided with a biasing means.